Double suspension bicycle frame



FIG. 1 is a rear right side view of a double suspension bicycle frame showing our new design;

FIG. 2 is an enlarged rear right side view showing the rear dropouts thereof separately, for clarity of illustration;

FIG. 3 is an enlarged rear right side view showing the four bar linkage suspension thereof separately, for clarity of illustration;

FIG. 4 is an enlarged rear right side view showing the front tubes thereof separately, for clarity of illustration;

FIG. 5 is a right side elevation view of FIG. 1; and,

FIG. 6 is an enlarged section view taken along line 6—6 in FIG. 5.

The characteristic feature of the design resides in the shape of the rear dropouts, the linkages' pocket, the double plates and the trapezium-shaped front tubes. 

The ornamental design for a double suspension bicycle frame, as shown and described. 